Hi, unfortunately no, my project is not in a state that can be shared at the moment.
In case this helps you with reproducing the bug - I have just reloaded Unity now to do some more work and the bug is not occurring at the moment, and I am currently unable to reproduce it - although it may come back, in which case I'll try the capacity bump you mentioned. Earlier today when it first came up, I had just finished adding some 24 new tweens (pairs of tweens that scale up and then back down, using the OnComplete to pass control; also similar pairs for doing color) and had done a fair bit of component copy and paste-to-new to get those in place. I'd been repeatedly hitting Play in the editor and then stopping to tweak further. So possibly some sort of Unity or DOTween memory cache was building up and hit its upper limit, is all I can guess. That was my first suspicion anyway when I checked the active tweens count and saw I had gone past 256 total.
Anyway hopefully something I said in all that clicks and helps you find it, but if not then it's good to know there's the capacity workaround if I see it again.